The touch function works great, the lamp responds immediately to touch. There are a total of 7 well-chosen brightness levels, none of which is flickering, buzzing or similar. The light is very evenly and keeps the 6000 Kelvin quite awake, which I find enjoyable to work (approximately as a fluorescent tube). At its lowest setting, the light goes anyway to find your way around, for example, on the keyboard or something to read. The brightest lights, however, the desk well, so that one has at the edges still enough light. The light is then up a bit warmer, but they can still handle any problems.
Disadvantages are the somewhat low efficiency of about 60 lumens / Watt and the short with about 1.5 m power supply cable.
All in all, invested more than 25! Would I buy it again.